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PRE-SEISMIC GRAVITY DISTURBANCE OF HIGH FREQUENCY BEFORE Ms9.0 EARTHQUAKE IN JAPAN

Liu Ziwei1,2),Wei Jin1),Hao Hongtao 1),Wu Yunlong1) and Li Hui1) 1) Institute of Seismology,CEA,Wuhan 430071 2) School of Computer Science,Wuhan University,Wuhan 430079  
We have chosen fourteen gPhone spring gravimeters of China Gravity Network to form two observation sections,and analyzed the observation records(in March 1 to10) before the M s9.0 earthquake near Japan east coast.The results indicate that a kind of bell-like of abnormal gravity disturbance occurring at all littoral observation stations and the magnitude of abnormal gravity disturbance attenuate with the distance from epicenter.
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